Technical description and composition of the SONY KDL-55EX710 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-55EX710
Chassis / Version: AZ1-L
Panel: LTY550HJ02 L396-05515A
T-CON: TDL_C4LV0.4
LED driver (backlight): integrated into PSU
Power Supply (PSU): 1-881-955-11
MainBoard: 1-881-636-41
IC MainBoard: TAS5707
Tuner: SUT-HE111T
Technical Specifications KDL-55EX710
SONY KDL-55EX710
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-55EX710 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In some of these cases, a malfunction is detected in the power module 1-881-955-11. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
Often in such cases, there is no LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the motherboard 1-881-636-41 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In cases of attempts to repair the MB board (SSB), it is necessary to check the serviceability of its elements - TAS5707 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If you suspect a malfunction of the SUT-HE111T tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
It should be remembered! Attempts to independently repair the SONY KDL-55EX710 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual ---------------------> SONY KDL-32EX710, KDL-32EX710, KDL-32EX710, KDL-40EX710, KDL-40EX710, KDL-40EX710, KDL-40EX713, KDL-46EX710, KDL-46EX710, KDL-46EX711, KDL-46EX711, KDL-46EX713, KDL-55EX710, KDL-55EX710, KDL-55EX711, KDL-55EX711, KDL-55EX713 Chassis AZ1-L
(Service Manual 37 pages of 2010 for the models KDL-32EX710, KDL-32EX710, KDL-32EX710, KDL-40EX710, KDL-40EX710, KDL-40EX710, KDL-40EX713, KDL-46EX710, KDL-46EX710, KDL-46EX711 -46EX711, KDL-46EX713, KDL-55EX710, KDL-55EX710, KDL-55EX711, KDL-55EX711, KDL-55EX713.)
The appearance of MainBoard 1-881-636-41 is shown in the figure below:1-881-636-41
The appearance of the power supply
Main features of the device SONY KDL-55EX710:
Installed matrix (LED-panel) LTY550HJ02 L396-05515A.
The matrix control uses the Timing Controller (T-CON) TDL_C4LV0.4.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SONY KDL-55EX710 TV is carried out by the power module 1-881-955-11, or its analogues.
MainBoard - the main board (motherboard) is a module 1-881-636-41, using TAS5707 chips and others.
The SUT-HE111T tuner provides television reception and channel tuning.